The Tunisian government expects all visitors exchange currency at only authorized institutions. Receipts of all financial transactions must be kept, as authorities will want to examine them upon leaving the country. A visitor can only reconvert 30% of their their original exchange into a different currency.
While in Tunisia, credit cards can be used in some stores and restaurants. Also, depending on a visitor's banking situation, Automatic Teller Machines (ATMs) can convert withdrawal transactions into Tunisian Dinars. Depending on the two banks invovled, a separate funds conversion fee will likely apply. Again, all money withdrawn as Tunisian Dinars are subject to the same receipt requirement and 30% reconversion policy.
Banks, when exchanging travelers checks, will require to see your passport and a receipt for the check's original purchase. Post offices deal in cash exchanges only, and as stated above, receipts for all transactions must be kept.
